Custom logger with winston snippet

customLogger.js

const winston = require('winston')
const { createLogger, format } = require('winston')
const { combine, timestamp, printf } = format
const moment = require('moment')
require('winston-daily-rotate-file')

// SEND LOGS TO A BUCKET
/*
const S3StreamLogger = require('s3-streamlogger').S3StreamLogger
const s3Stream = new S3StreamLogger({
    name_format: `api-gateway-${moment().format('YYYY-MM-DD-h.mm.ss')}.log`,
    upload_every: process.env.UPLOAD_EVERY, // will upload every 5 minutes
    bucket: process.env.BUCKET,
    access_key_id: process.env.ACCESS_KEY_ID,
    secret_access_key: process.env.SECRET_ACCESS_KEY
})
*/

const myFormat = printf(options => {
    return `${options.timestamp} [${options.level}]: ${options.message}`
})

/*
                    Levels :
             0       Emergency: system is unusable
             1       Alert: action must be taken immediately
             2       Critical: critical conditions
             3       Error: error conditions
             4       Warning: warning conditions
             5       Notice: normal but significant condition
             6       Informational: informational messages
             7       Debug: debug-level messages
*/

const myCustomLevels = {
    levels: {
        emergency: 0,
        alert: 1,
        critical: 2,
        error: 3,
        warning: 4,
        notice: 5,
        info: 6,
        debug: 7
    },
    colors: {
        emergency: 'red',
        alert: 'orange',
        critical: 'red',
        error: 'red',
        warning: 'yellow',
        notice: 'cyan',
        info: 'blue',
        debug: 'green'
    }
}

const logger = createLogger({
    format: combine(
        timestamp(moment().local()),
        myFormat
    ),
    levels: myCustomLevels.levels,
    transports: [
        new winston.transports.File({
            filename: `my-log-${moment().format('YYYY-MM-DD')}.log`,
            level: 'debug'
        }),
        new (winston.transports.DailyRotateFile)({
            filename: 'my-log-%DATE%.log',
            datePattern: 'YYYY-MM-DD',
            zippedArchive: true,
            maxSize: '20m',
            maxFiles: '7d'
        })
    ]
})

/* istanbul ignore next */
if (process.env.ENABLE_CONSOLE_LOG === 'true') {
    logger.add(
        new winston.transports.Console({
            format: combine(
                winston.format.colorize(),
                timestamp(moment().local()),
                myFormat
            ),
            levels: myCustomLevels.levels
        }))
}

winston.addColors(myCustomLevels.colors)

module.exports = logger

For using this snippet just require the snippet file on yours app like:
"const logger = require('./customLogger.js');"
and use it as the example given "logger.info({ message: 'winston logger started' });".